Dental flask



Feb. 12, 1935.

J. J. E. BAUMGARTEN DENTAL FLASK Filed Sept. 25, 1953 2 Sheets-Sheet lFeb. 12, 1935.

1 J. J. E. BUMGARTEN DENTAL FLASK Filed Sept. 25, 1955 2 SheetsSheet 2Patente Feb. 12, 1935 UNITED STATES PATENT OFFEQE DEN'IAL FLASK JuliusJ. E. Bumgarten, Portland, Oreg. Applicatiofi September 25, 1933, SefialN0. 690,832

2 Claims. (GI. 18-33) This invention rela.tes generally to the art ofdentistry, and particularly to a. denta1 flask for use in connectionwith the forming f plaiges.

The main object 01 this invention is to provide a flask Whichwill-accommodate itself to a wide 1ange of work and Which can be easil yoperated. With a minimu.m expenditure of time and in which the moldedobjects can be easily removed from the flask without enda ngering theproduct or marring the fiask itself.

These, and other 0bjects, will become more apparenc from thespecification following as illustrated. in the ac ;ompanying dravvings,in which:

Fig. 1 is a vertical section through the bottom of ehe fiask showing thet1ia1 plate sei; in plaster.

Fig. 2 is a vertical section showing the top of the fiask secured inposition.

Fig. 3 is a side elevation cf the flask showing a portion cf the topbroken away in section discl-osing the p1astic material filling theflask and. projecting above ehe top thereof.

Fig. 4 is a view similar to Fig. 3 showing the cap in p1ace with theexcess materials escaped from the vents.

Fig. 5 shows the flask separated a1ong a, line between its upper antilower portions with a, blank in position.

Fig. 6 is a. view similar to Fig. 5 showing the fiask after heat andpressure ha.ve been applied. and the upper and lower portions lockedtogether.

Fig. 7 is a perspective view of the cap.

Fig. 8 is a perspective view of the upper part of the fiask.

Fig. 9 is a. perspective view of the bottom part 01 the fiask.

Fig. 10 is a perspective view of the locking fing.

Fig. 11 is a section tanken .along the 1ine 1111 in Fig. 12.

Fig. 12 is a. section haken a1ong the line 1212 in Flg. 6.

Similarnumbers of reference refer 1:0 similar parts throughout theseveral views.

Referring in detail 110 the drawings, the device consists 015 threeprincipal elements, namely a bottom, a top and a cap which will bedescribed separately.

The bottom 15 of the fiask has a cup-shaped recess 16 formed therein andits flat bottom 17 is provided with outlet openings 18 for the escape ofexcess plastic material 19 in which is first mounted the trial pla.te 20whose teeth 21 project upwardly (as shown in Fig. 2).

The plastic bottom 15 is provided. on its under side with a locking rihg22 (shown in Fig. 10) which ring is provided on .its unter edge with aplurality of 1ugs 23, each cf which is provided with a keyhole s1ot 24.Eaeh 1ug 23 is providec1 with hook ends 25 for a spanner wrench 26 bymeans 0:E which a limited amount of rotation may be appliedto thelocking ring 22. Rotation 01 5 the ring 22 islimited by means of a screw27 which is threaded into the flask bottom 15 and occupies the spacebetween the cutaway portion 28 of the locking ring 22.

The ring 22 is held against the fa.ce 29 of the bottom 15 by the rollededge 30. The face 29A 01 the ring 22 is provided with inclined portions31 directly across each of the slots 24, the deeper portion of theinclined face being nearest the large portion of the keyhole slot 24.

The bottom 15 is provided With radial lugs 32 through one end. of eachof which extends a tapering hole 33. The lugs 32 constitute strikingpoints to facilitate the opening 01 the fiask.

The top 34 of the fiask is in the form of a hollow cone whose interior35 is substantially the same as the recess 16 of the bottom 15. The top34 is provided with lugs 36 on its exterior surface, in which lugs arem0unted the tapering pins 37 each of which is provided with oppositeside notches 38. The head 39 of each pin 37 is adapted to pass throughthe enlarged portion 40 of the s1ots 24, while the n otchecl portion 4101 the pins 37 can pass through the narrow portions of the slot 24. Thesmaller end 42 of the flask top 34 is provided with an external thread43 which is preferably of the cut-away type (as shown in the drawings)to expeditethe application and removal thereof.

The cap 44 consists of a circular plate provided with a, flange 45 onwhose inner side are formed the threads 46 which are adapted to engagethe threads 43 of the top 34. The cap 44 is provided with openings 47for the escape of surplus plastic materials 48. The cap 44 is alsoprovided with out-turned 1ugs 49 by means 01: which the cap may betightened. er loosened with relation to the top 34.

I1: is desirable eo provide out1et openings 50 along the parting line 51of the flask and also 110 form a depression 52 in the outer wall of thetop 34 for use in connection with dry heat.

The operation 0f the device is as follows: It is assumed that the tria1platze 20 has been formed. and. that it is now desired 110 produce a,permanent 50 plate therefrom. The bottom 15 of ehe fiask* is placed inthe position shown in Fig. 1 and filled With a p1a.stic material 19 inwhich the trial plate 20 is mounted, as shown. The next step is toplatze the flask top 34 in pla.ce (as shown in Fig. 55

2) locking same in position by rotating the locking ring 22 by means ofthe spanner wrench 26, or by tapping same.

The surface 53 of the plastic material 19 is coated with a, suitalblematerial 130 prevent it from adhering to the plastic material 48, whichis now inserted into the top 34 (as shown in Fig. 3) leaving .it wellwound above the end 42 of the flask. The cap 44 is now screwed intoplace causing the surplus material 48 to exude from the openings 47,after the main body of the material is tightly compressed. around theteeth 21 and the wax of the trial plate 20. The surplus material 48-isthen removed and the entire flask subjected heat and the wax cf thetrial plate 20 removed by well known methods after the flaskhas beenseparated by the unlocking of the ring 22.

It will be noted um thelzeeth 21 have beb'nie lodged in the material 48while the wax portion of the trial platze 20 is removed. In its place isnow inserted a blank 54 (as shown in Fig. 5). l-Ieat is now applied. byany convenient means to softem the blank 54 and pressure is applied toforce the material in the blank into the space previously occupied bythe wax of the trial plate 20.

When the upper and lower parts of the mold are in engagement the lockingring 22 is turned to hold the halves of the flask together after whichthe fiask can be removed 110 a curing com1uartment leaving the pressfreefor other operations and thereby encouraging the operator to fully eurethe product instead of elncouragin'g' under-curing in order to regainthe use cf the press, as is now the common practice.

It is highly desirable coat the interi'or of the fiask with a polishedchromium platze which greatly expedites the removal of the plasticmaterials therefrom.

I claim:

1. A dental flask having in combination a circular receptacle havingparallel openings formed in its outer Wall, equi-distant from andparallel to its axis, an upper fiask portion comprising a tapering ringwhose interior is substantially the same shape and size as is theinterior 015 the receptacle, said ring having tapering posts disposedaround the wide end thereof adapted to register with the holes in saidbottom portion, each of said postshaving notches formed on the inner andouter sides thereof, a locking ring associated with saicl bottomportion.and rotatable with relation thereto having keyhole slots formedthereinthe large portion 015 which will receive the heads of said postsand the portion of said posts between said r 1otches passing freelythrough the narrow portioh of said keyhole s'l0ts, and a cap removablysecured to sa'id upper flask portionby means 015 a fractiorial thread,saicl bottom portion; locking ring and cap having 'out-turnedprojections formell thereon adapted to facilitate the relative rotatio nthereof.

2. The substance of claim 1,-said locking ring having the portionthereof on the outside of said keyhole slots inclined exert a weclgingaction against said posts when said ring is rotated.

' JULIUS J. BAUMGARTEN.

